Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 20, Issue 9, Pages 6201-6209Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-013-1660-7
Keywords
4-Fluoroaniline degradation; Autoinducer release; Biofilm formation; EPS secretion; Bioaugmentation; Acinetobacter sp
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Funding
- National Science Foundation of China [21107095]
- Natural Science Foundation of Zhejiang Province [Y5110019]
- Special Foundation of Young Scientists of Zhejiang Gongshang University [QZ11-7]
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To develop a bacterial bioaugmentation system for fluorine-containing industrial wastewater treatment, optimal conditions for 4-fluoroaniline (4-FA) degradation and autoinducer release in Acinetobacter sp. TW were determined. Quorum sensing in biofilms of strain TW was also investigated. Different optimal conditions exist for 4-FA degradation and autoinducer release, particularly with regard to pH. Quorum sensing modulates extracellular polymeric substance (EPS) secretion and biofilm formation in the strain but plays no role in 4-FA degradation. Under optimal conditions for 4-FA degradation, the release of N-3-oxo-hexanoyl-homoserine lactone (3-oxo-C-6-HSL) and N-hexanoyl-homoserine lactone (C-6-HSL) in strain TW was significantly lower than required for quorum sensing. Under optimal conditions for autoinducer release, on the other hand, 3-oxo-C-6-HSL and C-6-HSL levels exceeded the quorum sensing thresholds, thereby inducing EPS secretion and biofilm formation. We conclude that the optimal conditions for autoinducer release (25 A degrees C, pH 5, 800 mg L-1 4-FA, and 0 % NaCl) are suitable for bacterial colonization in bioaugmentation, while those for 4-FA degradation (25-30 A degrees C, pH 8 and 800 mg L-1 4-FA) maximize the system performance after colonization.
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